Which company owns MAC address prefix 54:FB:58?

MAC address prefix 54:FB:58 is registered to WISEWARE, Lda in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:FB:58 has a network interface built by WISEWARE, Lda.

What is the OUI 54:FB:58?

54:FB:58 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WISEWARE, Lda. It covers every address from 54:FB:58:00:00:00 to 54:FB:58:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-FB-58.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:FB:58:00:00:00 that is 54:FB:58 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is WISEWARE, Lda located?

WISEWARE, Lda is listed at Centro Social e Administrativo da ZIV Zona Industrial de Vagos Portugal PT 3840-385 in the IEEE OUI registry entry for 54:FB:58. This is the address the organization registered with the IEEE, which may differ from its current operating address.

WISEWARE, Lda

MAC address prefix 54:FB:58 is registered to WISEWARE, Lda in the IEEE OUI registry. Any device whose MAC address begins with 54:FB:58 has a network interface built by WISEWARE, Lda. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from 54:FB:58:00:00:00 to 54:FB:58:FF:FF:FF.

OUI prefix: 54:FB:58
Hyphen form: 54-FB-58
MAC range: 54:FB:58:00:00:00 – 54:FB:58:FF:FF:FF
Addresses in block: 16,777,216
Organization: WISEWARE, Lda
Address: Centro Social e Administrativo da ZIV Zona Industrial de Vagos Portugal PT 3840-385
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "WISEWARE, Lda"
archived source →
2026-07-17Assigned to "WISEWARE, Lda"

Nearby in the registry

The prefixes assigned immediately before and after 54:FB:58:

FAQ

Which company owns MAC address prefix 54:FB:58?: MAC address prefix 54:FB:58 is registered to WISEWARE, Lda in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:FB:58 has a network interface built by WISEWARE, Lda.
What is the OUI 54:FB:58?: 54:FB:58 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WISEWARE, Lda. It covers every address from 54:FB:58:00:00:00 to 54:FB:58:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-FB-58.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:FB:58:00:00:00 that is 54:FB:58 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is WISEWARE, Lda located?: WISEWARE, Lda is listed at Centro Social e Administrativo da ZIV Zona Industrial de Vagos Portugal PT 3840-385 in the IEEE OUI registry entry for 54:FB:58. This is the address the organization registered with the IEEE, which may differ from its current operating address.